摘要
The CCT curves of supercooled austenite were investigated by using THERMECMASTOR-Z simulation machine, test samples refined from 50 kg vacuum induction furnace and two-stage controlled roiling in laboratorial condition. Test results show that influence of cerium （Ce） addition in low sulfur Nb-Ti-Bearing steel is as follows： Ce can increase the transformation point tara and tAr1, enlarge the interval of transformation （tAr3-tAr1） . Ce moves CCT and rightwards , and reduces hardenability. Ce increases bainitic transformation temperature and enlarges curves upwards interval of bainite formation. With higher cooling rates, Ce changes the martensite from coarse strip to fine strip. It decreases Ms, enhances the trend of lath martensitic structure and limits the formation of lamellar crystal.
The CCT curves of supercooled austenite were investigated by using THERMECMASTOR-Z simulation machine, test samples refined from 50 kg vacuum induction furnace and two-stage controlled roiling in laboratorial condition. Test results show that influence of cerium （Ce） addition in low sulfur Nb-Ti-Bearing steel is as follows： Ce can increase the transformation point tara and tAr1, enlarge the interval of transformation （tAr3-tAr1） . Ce moves CCT and rightwards , and reduces hardenability. Ce increases bainitic transformation temperature and enlarges curves upwards interval of bainite formation. With higher cooling rates, Ce changes the martensite from coarse strip to fine strip. It decreases Ms, enhances the trend of lath martensitic structure and limits the formation of lamellar crystal.
基金
ProjectsupportedbytheNationalItemsof10.5Project
